(x-2)(x²+4)

3x⁷*x⁴+2x*x²*x⁴-4x⁵*(-x)² (x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3 (4x³)²×[x³-x(2x-1)] (x-2)(x²+4) 化简{x²-2x分之x+2-x²-4x+4x分之x-1}除以X分之(x-1)(X-4)乘以（2-x） 4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½ [（x+2）/(x²+2x)-(x-1)/(x²-4x+4)]÷(x-4)/x (2x-6)/(x²-4x+4)÷(3-x)/(x²+6x+9)×(2-x)/(x+3) 计算:2x/(x-2)(x+1)÷(1－x/x+1)-x²+2x/x²-4? 化简,x²+4x /(2x-4)(x+4)-x+2/x² -4 (x+1)/(x²+3x+2)+(x²-2x)/(x²-4) x²-2x分之x+2-x²-4x+4分之x-1